Western Jin

The Western Jin Dynasty was a Chinese empire that was the successor state to Cao Wei, taking over power in a coup in 265 after the Wei conquest of Shu Han. Jin's emperor Sima Yan went on to conquer Eastern Wu in 280, ending the Three Kingdoms, and reuniting the former Eastern Han empire. The Western Jin were torn apart by the War of the Eight Princes from 300-310 AD, leaving Sima Yue as emperor. However, when he took power, the Wu Hu tribes invaded Jin and conquered northern China. Sima Rui fled east to Jiangnan and the Eastern Jin ruled China south of the Yangtze River until 420.

History
The Jin Dynasty was founded by Wei general Sima Yi's sons Sima Shi and Sima Zhao when they seized power from the illustrious Cao family, and after Sima Zhao's death in 265 AD, his son Sima Yan overthrew the last Wei emperor, Cao Huan. The Jin Dynasty fought the Wu to the southeast, having controlled the north and west of China after Wei's conquest of Shu Han in 263. The Jin Dynasty eventually built a navy and trained marines and conquered Wu in 280 AD, eliminating all resistance. The Jin Empire flourished in peace for ten years, when Sima Yan fell ill and died. After Sima Yan's death in 290, his sons divided the empire between them and each of them seized power and in turn were deposed and killed. Sima Yue, the youngest, was the last man standing from this crisis, and he seized power as Western Jin emperor in 310 AD. He lasted for one year, when the Wu Hu tribes conquered Luoyang and proceeded to capture the rest of the Jin Empire as of 316 AD. The surviving Sima, Sima Rui, fled east to Jiangnan and ruled the lands south of the Yangtze River with Eastern Jin. The Eastern Jin ruled until 420.